Lamp base



FIG. 1 is a perspective view of lamp base showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a perspective view thereof when in use.

The lamp base is broken away to indicate indeterminate length. The lamp holders are shown in broken lines in FIG. 8 for illustrative purposes only and form no part of the claimed design. 

The ornamental design for lamp base, as shown and described. 